PHOTOMETRIC SCALE. 137 



" The following short table of the photometric quantities of 

 1 7 stars of the 1 st magnitude (as obtained from the photome- 

 tric scale of magnitudes) may not be devoid of interest:" 



Sirius . . . 4'165 



17 Argus 



Canopus .... . 2-041 



a Centauri ...... I'OOO 



Arcturus ...... 0*718 



Rigel 0-661 



Capella 0-510 



aLyrae 0-510 



Procyon . ... 0-510 



a Orionis 0-489 



aEridani 0-444 



Aldebaran 0-444 



/3 Centauri 0-401 



aCrucis 0-391 



Antares v 0'391 



a Aquilse 0*350 



Spica 0-312 



" The following is the photometric quantity of stars strictly 



belonging to the 1, 2 6 magnitudes in which the 



quantity of the light of a. Centauri is regarded as the unit :" 



Magnitude on the vulgar scale. Quantity of Light. 



1-00 0500 



2-00 0-172 



3-00 0-086 



4-00 0-051 



5-00 0-034 



6-00 0-024 



